you're using the word mensch wrong.
Commonly, mensch means good man or good person.
you could say he is a putz or shmuck perhaps.
Maybe he's just a shlimazel.
Or perhaps feygalah. not that there's anything uh, wrong, with that.
he could be full of mishigas. or really meshugana.
BTW, there are plenty of nice shiksa out there.
you're from NY, right?
Clearly, you don't know bupkes.
But don't kvetch about it.